[PATCH] generic/642: fix SOAK_DURATION usage in generic/642

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Misspelled variable name.  Yay bash.

Fixes: 3e85dd4fe4 ("misc: add duration for long soak tests")
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 tests/generic/642 |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/generic/642 b/tests/generic/642
index e6a475a8b5..4d0c41fd5d 100755
--- a/tests/generic/642
+++ b/tests/generic/642
@@ -49,7 +49,7 @@ for verb in attr_remove removefattr; do
 done
 args+=('-f' "setfattr=20")
 args+=('-f' "attr_set=60")	# sets larger xattrs
-test -n "$DURATION" && args+=(--duration="$DURATION")
+test -n "$SOAK_DURATION" && args+=(--duration="$SOAK_DURATION")
 
 $FSSTRESS_PROG "${args[@]}" $FSSTRESS_AVOID -d $SCRATCH_MNT -n $nr_ops -p $nr_cpus >> $seqres.full